Table 1. COVID-19 ICU study regions, ICU admitted and IMV patient number and demographics, and study quality assessement.
| Reference ID (First author, publication month 2020) | Number of patients | Mean age ± SD | Gender (male) [n (%)] | Overall quality assessment | |
|---|---|---|---|---|---|
| ICU admitted | IMV patients in ICU | ||||
| China | |||||
| Bi/April [12] | 19 | 18 | (30–70)a | 14/19 (74) | Good |
| Cao/May [28] | 18 | 14 | NM | NM | Good |
| Du/April [27] | 51 | 33 | 68.4±9.7 | 34/51 (71) | Good |
| Feng/April [14] | 29 | 22 | 64±13.4 | 71/114 (62) | Good |
| Guan/February [29] | 55 | 25 | 63 (53–71)b | NM | Good |
| Huang/January [32] | 13 | 4 | 49(41–61)b | 11/13 (85) | Good |
| Lapidus/April [16] | 59 | 40 | 62(52–70)b | 38/59 (64) | Fair |
| Lei/April [30] | 15 | ---- | 55(44–74)b | 5/15 (33) | Fair |
| Wang/April [33] | 344 | 100 | 64 (52–72)b | 179/344 (52) | Good |
| Xu/March [21] | 45 | 20 | 56.7 + 15.4 | 29/45 (64) | Good |
| Yang/February [31] | 52 | 22 | 59·7± 13.3 | 35/52 (67) | Good |
| Zheng/April [22] | 34 | 15 | 66(58–76)b | 23/34 (68) | Fair |
| Zhou/March [20] | 50 | 32 | NM | NM | Good |
| USA | |||||
| Arentz/March [8] | 21 | 15 | 70(43–92)a | 11/21 (52) | Fair |
| Argenziano/April [9] | 231 | 215 | 62.2±14.7 | 156/231 (68) | Good |
| Auld/April [10] | 217 | 165 | 64(54–73)b | 119/217 (55) | Fair |
| Bhatraju/March [11] | 24 | ---- | 64±18 | 15/24 (63) | Good |
| Goyal/May [26] | ---- | 130 | 64.5 (51.7–73.6)b | 92/130 (71) | Fair |
| Myers/April [17] | 113 | 103 | 63 (53–73)b | 74/113 (66) | Good |
| Paranjpe/April [25] | 385 | ---- | NM | NM | Good |
| Richardson/April [18] | 1281 | 1151 | 63 (52–75)b | 3437/5700(60) | Good |
| Ziehr/April [23] | 66 | 66 | 58 (23–87)b | 43/65 (65) | Good |
| UK | |||||
| ICNARC/May [24] | 7542 | 4522/6880 | 59.3± 12.5 | 5389/ 7538 (72) | Good |
| Docherty/April [34] | 1914/11185 | 497 | 72(57–82) | NM | Fair |
| Mexico | |||||
| Valente-Acosta/May [35] | 33 | 12 | 60.6± 12.68 | 23/33 (70) | Good |
| Italy | |||||
| Grasselli/April [15] | 1591 | 1150 | 63 (56–70)b | 1304/1591 (82) | Good |
| Spain | |||||
| Borobia/May [13] | 237 | ---- | 64(54–71)b | 57/75 (76) | Good |
| France | |||||
| Simonnet/April [19] | 124 | ---- | 60 (51–70)b | 90/124 (73) | Good |
Studies based on reporting region and identified by first author and 2020 publication month, the number of ICU admitted and IMV patients in ICU and their age and sex as reported per study; and overall quality assessement of the studies by the NIH quality assessment tool [2]. Abbreviations: NM = Not mentioned
a = Data range
b = Data are reported as median (IQR).